Adam_Mcconnell_Fall_2012_2nd_revision

The World Leader in High Performance Signal Processing Solutions

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COOP Presentation - Fall 2012Adam McConnell

3rd RotationNC State University – Electrical Engr. & Mathematics

SeniorHSSA Group

Supervisor: Tom MacLeod

—Analog Devices Confidential Information—

Overview

What is ADIsim?

Projects I worked onDigital Timing Map for AD719x family of ADC’s LabVIEW wrappers for AD7190 Features and Digital TimingPython Script for code reuse and copying directories

Challenges


The Problem


QUESTIONHow can you provide customer support efficiently and

effectively without the availability of direct support?

Self-service Model support

ADIsimWritten in C++ consisting of a Simulator, Library, Dll, Testing

Environment Basis which client programs call on and allows customer to

interactively play with the part instead of reading data sheets 40+ pages long

‘Visual Hardware’ – Acts as if you have hardware connected


What is ADIsim?ADIsim

HyperMaps PMFFeatures EqMaps

Timingmaps Client

Bottom Level

Top Level This is what customer uses

Active Functional ModelWeb Applications

Eval SoftwareMatlab


What are EqMaps?Map of equations written in a XML file interpreted by ADIsimEquation is determined by inputs

Input

EQ0*

(Chop On is true)

EQ1*

(Chop Off is true)

Combiner

Output

EQ0 EQ1


Block declarations

Connections


They can get complicated


Transferring EqMaps from XML C++

Why is it helpful?Easy to developEasy to maintainPortable

80 line XML file gets compressed to 3 lines of code:


HyperMaps?

Multi-Variable look-up tables

Can’t use EQ maps here.

What about using a Filter Word of 1000 ?Uses Linear, Polynomial, Spline interpolation methods


What is a Product Model File (PMF)?

Series of logic or functional blocks that when tied together provide certain behavior of an ADI product.

These logic blocks can be, but not limited to, EqMaps, HyperMaps, DSP applications, Math functionsThey are independent of each otherImplemented in ADIsim Library


Example: AD9480 PMF, XML ExcerptList of logic blocks Connections, Strings tying blocks together


How ADIsim interprets the PMF

Settings Inputs

pi2 pi1 pi3

eq1

Output

Latency

INL

Jitter

PolyNoise

Splitter

eq3eq2

Combiner

Hypermaps

EQ maps


Active Functional Model (AFM)

Teaching toolVisually shows the inner workings of a part without all the

equipment and test benchesMimics/Simulates behavior

Instead of :


TimingMaps (Primary project)

Describes the timing and setup behavior of a product within a particular mode

For the AD7190, 24-bit 4.8kHz ADC, needs to display clocks, data signals, timing and output codes for the continuous read mode


TimingMaps


Problems & Improvements

Implemented entirely in LabVIEWChanges to model behavior of a new product is a hassleChanges to code leads to bugs/problems and debugging in LV can

be a pain

“every line of code will be read (and maintained) at least 10 times after you write it”Trying to reverse engineer LabVIEW code is a punishment

Implementing in C++ allows portability, flexibility and readability


What does this LabVIEW code do?


Why do you hate yourself?


Template functions


Interpolate & SerializerInterpolation value of 2

Horner’s Method : 5 % 2 = 1 5 / 2 = 2 2 % 2 = 0 2 / 2 = 1 1 % 2 = 1 1 / 2 = 0

101 2 = 5 10


Current StatusEntirely implemented in C++Used LabVIEW wrapper to display results


Python ScriptAll this work to model one product?

Is there a generic framework for the entire AD719x family?24-bit Sigma-Delta ADC with PGA, common mode types, shared

inputsCarry over work from one project to the other

Copy/Paste could work but then you would need to go into every file/folder to change AD7190 to AD7191, etc.

Specifications for script:Inputs: directory of project

name of project, ‘X’name of new project, ‘Y’

Copy all subdirectories/files in CWD into new directory changing all words matching ‘X’ to ‘Y’Creates a copy of the project using a SVN checkout


Flow diagram of scriptCreate new directory

Separate files from folders in CWD

Copy/Rename files into new directory

subdir

top Go to next folder one level above

YES

NO

• Configure : core function

• CopySubdir : recursive function that goes into an arbitrary depth of directories

• CopyFile : copy file into new dir with new name, replaces every instance of ‘X’ to ‘Y’

• TestFile : determines if file is ascii or unicode

• ReplaceAsAscii• ReplaceAsUnicode

• GenDirList : returns two lists, one of files and the other of folders

• GetDir : returns pathname one level higher than current

• Remove : deletes entire directory made by SVN check-out


Challenges

Understanding ADIsimGoing from subtle details to big picture

First time using LabVIEW extensivelyWriting LV wrappers and successfully calling a C++ dll

Since my timing maps were using structs, I needed to cluster inputs together but the inputs were getting mismatched when passed to dll

First time writing software in C++Wasn’t comfortable using pointersWriting template functions


Special thanks to:

Prissy Polly’s Group : Tom MacLeodMichael SinkMichael Crawford

Anuja GogateJim CampMeredith Morgan

Questions?

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